LANGMUIR
·
2024
·
IF 3.7
Zhenghao Shi,Yifeng Sheng,Jianhui Wu,Jiwei Cui,Wei Lin,To Ngai
Waterborne polyurethane (WPU) latex nanoparticles with proven interfacial activity were utilized to stabilize air–water interfaces of Pickering foams through interfacial interaction with hydrophobic fumed silica particles (SPs). The rheological properties of the Pickering foam were tailored through adjustment of their SP content, which influenced their formability and stability. A Pickering foam stabilized with WPU and SPs was used as a template to prepare a WPU–SP composite porous film. The as-prepared film had intact open-cell porous structures, which increased its water absorption and water-vapor permeability. The porous film was used as a middle layer in the preparation of synthetic leather via a four-step “drying method”. Compared with commercial synthetic leather, the lab-made synthetic leather with a middle layer made of the WPU–SP composite porous film exhibited a richer porous structure, acceptable wetting on a fabric substrate, a thicker porous layer, and higher water-vapor permeability. This work provides a novel and facile approach for preparing WPU–SP Pickering foams. Furthermore, the foams have the potential to function as a sustainable material for creating a porous-structured synthetic leather made from WPU, which may be utilized as an alternative to solvent-based synthetic leather.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 3
·289
·
IF 2.935
Yulu Wang,Liqiang Jin
A novel self-colored waterborne polyurethane (SCPU) was synthesized and used in the preparation of a microfiber synthetic leather (MS-Leather) base in order to reduce the pollution caused byN,N-dimethylformamide (DMF) and dyes. The SCPU was prepared using the reaction of a reactive brilliant red K-2G with a waterborne polyurethane which was then extended via a first generation of hyperbranched poly(amine-ester). With the introduction of the dye, new absorption peaks at 1118 cm−1[S=O], 1413 cm−1[N=N], and 1635 cm−1[C=N] appeared in the Fourier transform infrared (FTIR) spectrum of SCPU, and SCPU mean particle size increased to 162 nm. The X-ray diffraction (XRD) peak intensity of SCPU at 19.27° was 1310 cts. The thermal stability of SCPU at 200–280 °C was inferior to that of the control sample; however, it improved at temperatures above 360 °C. Finally, a free-dyeing MS-Leather base prepared by using SCPU without DMF was manufactured. It was found that the dyes were distributed mainly in the polyurethane matrix rather than in the microfibers. Moreover, the color changes of the base before and after being washed in both a water and a soap solution were 0.93 and 4.21, respectively. This indicated that the base’s washing color fastness to water was better than to a soap solution.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
·
IF 8.7
Weiyi Xing,Jianchao Xi,Wei Cai,Weijie Zhang,Bangyu Wang,Liang Chen,Yuan Hu
Although leather can be functionally modified well, its origin will cause concern about the destruction of the ecological environment. Here, a novel multifunctional synthetic leather (denoted as FRTL) that integrates high tensile strength , flame retardancy, Joule heating, electromagnetic shielding, and strain sensing is reported. Benefiting from the excellent mechanical properties of the PU film, the leather exhibits a high tensile strength of 100.8 MPa. Based on the high conductivity of MXene , the leather possesses an electromagnetic shielding efficiency of 30.1 dB. FRTL also exhibits excellent flame retardancy, confirmed by the reduction of more than 32% in peak heat release rate. In addition, the controlled Joule heating properties enable the leather to cope with extreme cold weather. The obtained fabric can also detect various human movements. This work provides a facile method to fabricate the next-generation multifunctional protective leather, showing promising application in the field of smart firefighting.
研究领域:
材料科学
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纳米技术
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智能材料
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2024
·
IF 4.1
Yingting Yin,Wei Li,Jinbo Yao,Jiarong Niu
A series of flame-retardant waterborne polyurethane (AWPU-X) compounds with core–shell structures were synthesized by encapsulating hexaphenoxycyclophosphazene (HPCTP) with WPU. AWPU-X, melamine (MA), and AO10D3-WPU (a flame-retardant WPU self-made in the lab) were synergistically used to prepare flame-retardant microfiber synthetic leather by a two-step method, and the relevant properties of AWPU-X and the microfiber synthetic leather were characterized. The results showed that AWPU-X formed a core–shell structure and had good emulsion stability and film thermal properties. The limiting oxygen index (LOI) value of AWPU-11 reached 27.5% when the HPCTP addition was 11% by mass. The mechanical properties of the flame-retardant microfiber synthetic leather were improved, while the hand-feel of the leather was not affected. When the mass ratio of AWPU-11/MA/AO10D3-WPU was 60 : 20 : 20, the flame retardancy of the microfiber synthetic leather was the best, with the LOI value of 27.6%, no after-flame, and a damage length of only 0.5 cm in the vertical flame test. At the same time, the peak heat release rate (PHRR) and total heat release (THR) in the cone calorimeter test were reduced by 42% and 30%, respectively. Although the introduction of flame-retardant components decreased the thermal performance of the microfiber synthetic leather, the thermal decomposition residual carbon rate was significantly improved. Based on the results of SEM-EDS, TG-IR, and Raman tests, it was speculated that the flame retardancy of the microfiber synthetic leather was primarily attributed to the joint action of the flame-retardant components in both the gas and condensed phases.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 1
·51440
·
IF 3.125
Na Xu,Yanmei Xing,Xuechuan Wang,Longfang Ren,Taotao Qiang
Superfine fiber synthetic leather is a high-grade artificial leather product with numerous characteristics and advantages. However, compared with natural leather, it shows poor moisture absorption and moisture permeability, and it gives people a hot and tacky feeling; thus, the improvement of these properties has become a popular topic in the industry. In this paper, the “click” chemistry method was employed to modify the nylon fiber of the superfine fiber synthetic leather base with waste collagen to improve the moisture absorption and permeability of the superfine fiber synthetic leather base, thus enhancing the hygienic performance and wearing comfort of the end products, realizing waste recycling. This study obtained the optimal reaction conditions for the “click” modification of unfigured sea-island superfine fiber synthetic leather base with collagen methacrylamide. The characterizations by static contact angle measurements, attenuated total reflection infrared spectroscopy, and X-ray photoelectron spectroscopy analysis confirmed that collagen was successfully grafted onto the surface of the nylon fiber. Compared with the original base, the moisture absorption, and permeability of the base were improved by 602.4% and 43%, respectively. This study shows the theoretical research significance and excellent practical value for the resource utilization of skin collagen waste.
研究领域:
材料科学
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生物化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
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IF 7.3
Jian Long,Qiang Gao,Haojun Fan,Jun Xiang
Replacing traditional solvent-based polyurethane with two-component solvent-free polyurethane (SFPU) is an efficient approach to achieving green, low-carbon manufacturing of synthetic leather, but the foaming technology of the coating has always been a challenge. In this study, ZnO nanoparticles (nano-ZnO) were in situ loaded onto the surface of 4,4′-oxibis(benzenesulfonyl hydrazide) (OBSH) first, and then the nano-ZnO-loaded OBSH was further modified with KH-550 to improve its dispersion in the SFPU matrix. Finally, zinc stearate (ZnSt2) was doped with nano-ZnO-modified OBSH to activate OBSH, that is, to reduce its decomposition temperature. By means of a synergistic activating strategy, the as-prepared composite foaming agent (CFA) shows a lower decomposition temperature of around 140 °C, and when applied in the manufacture of synthetic leather, a desirable foaming ratio, high peel strength, superior softness and resilience, as well as enhanced water vapor permeability were achieved. More importantly, compared with solvent-based synthetic leather, no VOC emission, zero solvent usage, and more than half reduction in energy consumption were also obtained. This approach offers a promising solution for the green, low-carbon manufacture of synthetic leather.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Futao Sai,Haitao Zhang,Jianbo Qu,Jianyong Wang,Xiuzhong Zhu,Peng Ye,Zhiliang Zhang
Recently, the self-healing and recyclability of waterborne polyurethane (WPU) has attracted significant research attention. Herein, different weight ratios of Diels-Alder (DA) diol and diacetyl oxime (DMG) were used as the reactive monomer with polytetramethylene ether glycol (PTMG), isophorone diisocyanate (IPDI) and dimethylolpropionic acid (DMPA). A series of thermal-driven self-healing and green recyclable waterborne polyurethane films (WPU-DMG x -DA y ) were prepared based on synergistic dynamic reactions of oxime-carbamate and DA bonds. We investigated the properties of WPU-DMG x -DA y emulsions by particle size and zeta potential tests, and the results show that these emulsions have excellent storage stability. The self-healing properties of WPU-DMG x -DA y films were identified by dynamic mechanical analysis . It was revealed that the WPU-DMG 4 -DA 4 film has the best self-healing capability, and the self-healing efficiency can reach 92. ± 0.1 % after self-healing at 120 °C for 4 h. The mechanism of the self-healing behavior was studied by Fourier transform infrared spectroscopy , and the effective reversibility of the oxime-carbamate and DA bonds were verified. In addition, thermal gravimetric analysis and tensile test results showed that the thermal stability and mechanical properties of the WPU-DMG x -DA y films were significantly improved. More importantly, the WPU-DMG 4 -DA 4 film can be dissolved in a mixed acetone/ethanol solvent at room temperature. The recycled polyurethane solution could be dispersed in water to obtain a WPU emulsion again. After being recycled three times, the recovery efficiency of the mechanical properties of the WPU-DMG 4 -DA 4 film was higher than 90.1 ± 0.1 %, and the recycled film maintained its thermal stability and self-healing behavior. Moreover, the synthetic leather obtained by compounding WPU-DMG 4 -DA 4 and non-woven fabrics could be easily recycled through this process. The basic properties of the recycled non-woven fabric remained unchanged and the recycled WPU-DMG 4 -DA 4 resin could be reused. Therefore, the WPU-DMG 4 -DA 4 resin has broad application prospects in the tanning industry.
研究领域:
材料科学
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聚合物化学
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环境科学
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）